//util.h
typedef unsigned char BYTE;
bool CreateTexture(unsigned int &Texture, const char * Image);
bool LoadHF(unsigned long &bWidth, unsigned long &bHeight, const char * Image);
unsigned char getHFvalue(int u, int v, int canal);
double getAlturaHF(double x, double z, double xmin, double xmax, double zmin, double zmax, double alturaMinima, double alturaMaxima);

